Glossary

Approximate flag — attribute in a GEM that when turned on indicates that the entry is not considered equivalent

Applied mapping — distillation of a reference mapping to conform to the needs of a particular application (e.g., data quality, research)

Backward mapping — mapping that proceeds from a newer code set to an older code set

Cluster — in a combination entry, one instance where a code is chosen from each of the choice lists in the target system entry, that when combined satisfies the equivalent meaning of the corresponding code in the source system

Choice list — in a combination entry, a list of one or more codes in the target system from which one code must be chosen to satisfy the equivalent meaning of a code in the source system

Combination flag — attribute in a GEM that when turned on indicates that more than one code in the target system is required to satisfy the full equivalent meaning of a code in the source system

Combination entry — an entry in a GEM for which a code in the source system must be linked to more than one code option in the target system to be a valid entry

Complete meaning [of a code] — all correctly coded conditions or procedures that would be classified to a code based on the code title, all associated tabular instructional notes, and all index references that refer to a code

Forward mapping — mapping that proceeds from an older code set to a newer code set

General Equivalence Map (GEM) — reference mapping that attempts to include all valid relationships between the codes in the ICD-9-CM diagnosis classification and the ICD-10-CM diagnosis classification

ICD-9-CM — International Classification of Diseases 9th Revision Clinical Modification (I-9)

ICD-10-CM — International Classification of Diseases 10th Revision Clinical Modification (I-10)

No map flag — attribute in a GEM that when turned on indicates that a code in the source system is not linked to any code in the target system

Reference mapping — mapping that includes all possible valid relationships between a source system and a target system


Reverse lookup — using a GEM by looking up a target system code to see all the codes in the source system that translate to it

Scenario — in a combination entry, a collection of codes from the target system containing the necessary codes that when combined as directed will satisfy the equivalent meaning of a code in the source system

Single entry — an entry in a GEM for which a code in the source system linked to one code option in the target system is a valid entry

Source system — code set of origin in the mapping; the set being mapped ‘from’

Target system — destination code set in the mapping; the set being mapped ‘to’